JPS6234333A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To shorten the whole time required for a copy by using a preceding beam as a reproducing beam, using a following beam as an erasing beam, and erasing the information reproduced by the preceding beam with the following beam. CONSTITUTION:A beam by a semiconductor laser 6 is irradiated onto a disk 1, and two beams of the preceding beam F which precedes in a signal direction of a track and the following beam B are generated. In case of a copy mode, first of all, in order to reproduce a data, the beam F is set to a reproducing power and lighted continuously, and switches 17, 18 are connected to a detector for detecting the beam F. The beam B is lighted continuously as an erasing power. Write of the data and its reproduction are executed by a sector unit, a reproducing data is written in a memory 22 at every 1 sector, and also the data on the disk 1 is erased by the beam B. A controller 23 instructs a write state, and the data stored in the memory 22 is written in an address to be copied. Therefore, the whole time of a copy can be shortened.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an optical information recording/reproducing device.

[Prior Art] A conventional optical information recording/reproducing device rotates a disk having a magnetic film, records information signals concentrically or spirally on the magnetic film using a light beam, and then records the recorded information in a concentric or spiral manner. It reproduces the signal.

This device is generally called a magneto-optical disk device, and uses a disk made of a thin film of ferromagnetic material on a non-magnetic material as a recording medium. Before recording, the magnetic film on the recording medium is magnetized in advance with its orientation aligned in the perpendicular direction.

Then, during recording, an external magnetic field is applied to irradiate the magnetic film with a light beam modulated according to predetermined information from a recording section composed of a laser light source, an imaging lens, and the like.

In this case, the temperature of the part irradiated with the light beam increases due to the light energy, and the temperature rises to the temperature of one cubit (approximately 160
℃), the magnetization direction becomes disordered. When the position of the light beam on the recording medium moves to another part as the recording medium moves, the temperature of the part that was irradiated with the light beam decreases, and the external magnetic flux causes the two surrounding areas to move. It is magnetized again in the opposite direction to the magnetization direction.

In this way, information is recorded on the magnetic film as magnetization reversal, and a signal train is formed.

On the other hand, during reading, a light beam oscillated from a semiconductor laser or the like in the reproducing section and polarized by a polarizer is irradiated onto the signal train formed on the magnetic film, and due to the magnetic Kerr (Kerr) effect, the irradiated area is It is reflected as light that is optically rotated according to the direction of magnetization. This reflected light is separated from the incident light by a beam splitter or the like in the reproducing section, guided to a light receiving element through an analyzer, and information is reproduced by detecting the magnetization direction from the polarization direction.

Incidentally, the feature of magneto-optical disks is that they can be recorded, reproduced, and re-recorded, and unnecessary information can be erased.

To erase recorded bits, rotate the recording medium and
While tracking the recording bit string, a light beam is irradiated onto the recording bit part, and by raising this part to one Curie point, a DC bias magnetic field is applied in the same direction as the magnetization direction of the part other than the recording bit in the recording medium. Cool while cooling. This erases the predetermined information.

Prepare for re-recording.

In addition, in the case of a mode in which data is moved on the same medium in order to organize data on the disk (hereinafter referred to as "transcription mode"), first the data that has already been recorded is read from the disk. . Then, the read data is recorded in a temporary storage memory, and the recorded contents are recorded in another location on the disk. Thereafter, on the next revolution of the disk, the transcription mode is terminated by one or more operating procedures that erase the previously read data.

As described above, after reading into the temporary storage memory, the area where the data was written is irradiated again to erase it. For this purpose, the operating procedure of reproduction, recording, and erasing is executed, and each operation requires the time of one rotation of the disk. Therefore, there is a problem that it takes a long time in the transcription mode.

[Object of the Invention] The present invention has been made by focusing on the problems in the prior art described above, and is capable of reducing the time required for data movement in a transcription mode in which data is moved on the same medium. The purpose of the present invention is to provide an optical information recording/reproducing device.

[Embodiments of the invention] FIG. 1 is a block diagram showing one embodiment of the present invention.

! Figure s2 is an explanatory diagram for explaining the operation of the above embodiment.

In the above embodiment, a magneto-optical recording medium 1 formed on a disk, a coil 2 for generating a bias magnetic field for erasing and writing, an objective lens 3 for focusing a light beam,
The multi-beam semiconductor laser 6 has two beams, each of which can be modulated individually, and laser drivers 4 and 5 that drive this laser unit.

It also includes a collimator lens 8 for collimating the laser beam, a polarizer 9 for linearly polarizing the laser beam, and a polarizer 9 for guiding the light beam from the laser 6 toward the disk, and for guiding the light beam from the laser 6 toward the disk. A beam splitter 10 is provided that allows the beam to pass toward the detector.

Further, a detector 14.1 detects the reflected light from the disk 1.
A beam splitter 11 that splits the beam into two directions (5), an analyzer 12.13 that passes only polarized light in a predetermined direction, and a detector 17.18 that switches the input to the differential amplification base 19 are provided.

Also, drive the bias magnetic field coil 2.

A driver 20 that changes the direction of the magnetic field, a demodulation circuit 21 that returns the signal read from the disk 1 to the original signal, a memory 22 that temporarily stores the read signal, and a controller 23 that controls the operation of each part are provided. Next, the operation of the above embodiment will be explained.

However, - Regarding the readout principle of magneto-optical signals.

The explanation is omitted.

The disk 1 is irradiated with a beam array as shown in FIG. 2 by a semiconductor laser 6. Two beams, a leading beam F and a trailing beam B, are generated with respect to the signal direction of the track.

First, the operation during recording will be explained.

During this recording, a signal is sent to the laser driver 4 for the preceding beam in the controller 23, and the preceding beam F is irradiated with the power necessary for recording, modulated according to the recording information. At this time, the subsequent beam B is
3 sends a reproduction signal to the subsequent beam laser driver 5, and the laser driver 5 lights up at all times with the reproduction power.

Here, at the same time as recording, the recorded signal is played back,
Compare with the original signal and check the writing status.

Moreover, the photodetector 14.15 detects the leading beam F,
Each of the subsequent beams B is divided so that it can be detected independently.

During recording, the input of the differential amplifier 19 is connected to the switch 12.1.
8 to a detector for detecting a subsequent beam, and its reproduced signal is sent to the controller 23 or the like.

Next, the transcription mode will be explained.

In the case of the transcription mode, first, in order to reproduce data, the leading beam F is set to the reproducing power and lit continuously, and the switches 17 and 18 are connected to the detector for detecting the leading beam.

Then, the subsequent beam D is turned on continuously as erasing power.

Here, data is written and reproduced in units of sectors. The memory 22 is a memory having a capacity of this l sector. When performing transcription, the reproduced data is written into the memory 22 sector by sector, and the data on the disk 1 is erased by the subsequent beam B. and,
The controller 23 instructs the write state and the address to be transcribed. Therefore, in the transcribing mode in the above embodiment, erasing operation is performed simultaneously with reproduction.

Therefore, after the reproducing operation, only the recording operation is required, so the time required for erasing can be omitted. Therefore, the time required for transcription becomes shorter overall.

[Effects of the Invention] According to the present invention, in the transcription mode, the time required for erasing can be omitted, so that the entire time required for transcription can be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is an explanatory diagram showing the operation of the above embodiment. 1... magneto-optical recording medium, 6...Multi-beam semiconductor laser, 4.5...Laser driver. 9...Polarizer. 22...Memory, 23...controller. Patent applicant: Canon Co., Ltd. Tora-so 7th grade direction 1QJ-

Claims (4)

[Claims] (1) An optical information recording/reproducing device that irradiates a leading beam and a trailing beam onto the same track, wherein the leading beam is used as a reproduction beam, the trailing beam is used as an erasing beam, and the leading beam is used as an erasing beam. An optical information recording/reproducing apparatus characterized in that information reproduced by a beam is erased by the subsequent beam. (2) The optical system according to claim 1, further comprising a memory for storing information reproduced by the preceding beam, and after being stored in the memory, the reproduced information is erased by the subsequent beam. Information recording and reproducing device. (3) The optical information recording and reproducing apparatus according to claim 1, wherein the information reproduced by the preceding beam is recorded at a different position on the same medium. (4) The optical information recording and reproducing apparatus according to claim 1, wherein the preceding beam is used as a recording beam, and the subsequent beam is used as a reproducing beam.